Color Os based.
Rest find yourself.
Use custom KK recovery from here.
I prefer [CWM Advanced Edition] PhilZ Touch 6.57.9 - cwm 184.108.40.206.
(Internal sd-card refereed as sdcard00, external as sdcard01)
Download rom zip file.
Put into sd card.
Flash the desired recovery.
Boot into recovery.
BACKUP CURRENT ROM
Wipe for flash of new rom.
Or wipe data/system/delvic cache/cache.
Select Install From SD (Internal or External)
Select the zip file and Select YES
THINGS TOBE NOTED
First boot takes time 3-5 mins so be patient.
wait until it boots.
After first boot ignore any systemui fc
@yuvaz21 from pittech forum